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The performance of a clever smoke detector may be evaluated based on different factors, containing the sensitivity of the detector toward fire effluents, nuisance rejection, energy consumption, installation cost, and response time.

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g. , based on detected control signals and transmission requests. Each of the above identified elements may be stored in one or more of the previously mentioned memory devices, and corresponds to a set of instructions for performing a function described above. The above identified modules or programs i. e. , sets of instructions need not be implemented as separate software programs, procedures, or modules, and thus various subsets of these modules may be combined or otherwise rearranged in various implementations. In some implementations, the memory 306, optionally, stores a subset of the modules and data structures identified above. Furthermore, the memory 306, optionally, stores additional modules and data structures not described above. FIG. 3B illustrates various data structures used by some implementations, including an event record 3168 i, a user profile 3163 i, and a device profile 3165 i. The event record 3168 i corresponds to an event i and data for the event i.


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So far, the devices have encountered more bears than criminals, but Chief Ed Stephens is still a fan. "Anything that helps keep the town safe, I'm going to do it," he said. But as more police agencies join with the company known as Ring, the partnerships are raising privacy concerns. Critics complain that the systems turn neighborhoods into places of constant surveillance and create suspicion that falls heavier on minorities. Police say the cameras can serve as a digital neighborhood watch. Critics also say Ring, a subsidiary of Amazon, appears to be marketing its cameras by stirring up fear of crime at a time when it's decreasing. Amazon's promotional videos show people lurking around homes, and the company recently posted a job opening for a managing news editor to "deliver breaking crime news alerts to our neighbors. ""Amazon is profiting off of fear," said Chris Gilliard, an English professor at Michigan's Macomb Community College and a prominent critic of Ring and other technology that he says can reinforce race barriers. Part of the strategy seems to be selling the cameras "where the fear of crime is more real than the actual existence of crime. "The cameras offer a wide view from wherever they are positioned. Homeowners get phone alerts with streaming video if the doorbell rings or the device's heat sensors detect a person or a passing car.